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Finding the Fourth Proportional to 15,361.21, 21,191.86 and 8,809.22

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Solution

The fourth proportional to 15,361.21, 21,191.86 and 8,809.22 is: 12,152.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,361.21 : 21,191.86 = 8,809.22 : x
  2. Step 2: Convert to fraction form
    15,361.21/21,191.86 = 8,809.22/x
  3. Step 3: Cross multiply
    15,361.21x = 21,191.86 × 8,809.22
  4. Step 4: Simplify right side
    15,361.21x = 186,683,820.94
  5. Step 5: Solve for x
    x = 186,683,820.94/15,361.21
  6. Step 6: Final answer
    x = 12,152.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.